Vibration at idle?

[rsm688]

Okay guys well I finally picked up my 06 H3 Project, it's got 95k miles on it and in need of a transfer case rebuild. It's been sitting for about 8 months but has been cranked occasionally. Anyways, at idle there is a vibration from the motor, its not severe but its very noticeable.

I've been reading and seen several people had that issue and it was cured by replacing a coil pack (was misfring on one cylinder), I went by Auto Zone and had my codes read and there were 0 codes. Could this still be an issue with a coil pack?

Since they are only around $23 each I was thinking about replacing all 5 coil packs, all 5 spark plugs, cleaning the throttle body, also going to replace the air filter and all fluids.

Any other cheap/easy to check possible culrpits for this vibration?

When you give it gas and raise the RPM the vibration goes away. Also, what should the idle typically be on the H3s?



Thanks,
Spencer

 

[poweraidon]

It could be the motor mount


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[poweraidon]

Okay guys well I finally picked up my 06 H3 Project, it's got 95k miles on it and in need of a transfer case rebuild. It's been sitting for about 8 months but has been cranked occasionally. Anyways, at idle there is a vibration from the motor, its not severe but its very noticeable.

I've been reading and seen several people had that issue and it was cured by replacing a coil pack (was misfring on one cylinder), I went by Auto Zone and had my codes read and there were 0 codes. Could this still be an issue with a coil pack?

Since they are only around $23 each I was thinking about replacing all 5 coil packs, all 5 spark plugs, cleaning the throttle body, also going to replace the air filter and all fluids.

Any other cheap/easy to check possible culrpits for this vibration?

When you give it gas and raise the RPM the vibration goes away. Also, what should the idle typically be on the H3s?



Thanks,
Spencer

And 23 dollars for a coil pack? At the autozone around me the cheapest one is 53


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[rsm688]

Ill have to inspect my motor mounts carefully, is there a spot they typically break at?

I had just googled and saw some for $23-27, after looking again it looks like they are a little more than I thought

 

[digglesworth]

I got a couple coil packs for around $70/each....

It may be worthwhile to clean the maf sensor and throttle body. At 95k, I'd put some fresh ac delco iridium plugs in it. Id try that before you spend extra money on coil packs. You should be able to differentiate between vibration transferring through a bad motor mount and something like a misfire...

 

[poweraidon]

I got a couple coil packs for around $70/each....

It may be worthwhile to clean the maf sensor and throttle body. At 95k, I'd put some fresh ac delco iridium plugs in it. Id try that before you spend extra money on coil packs. You should be able to differentiate between vibration transferring through a bad motor mount and something like a misfire...

I found coil packs on ebay for 23 bucks each... Do you think they're any good?


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[poweraidon]

And he's not getting any codes so that makes me think it's a bad motor mount.


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[rsm688]

Thanks guys, I will clean up the TB and sensors and throw in new plugs. I got out and cranked it up and let it run for about 10 minutes today and noticed the vibration went away and the RPMs at idle were a little lower. Cut it off and cranked it back up a minute or two later and vibe was back and rpm's a little higher again

 

[Airborne]

The I5 is notorious for excessive vibration. I'm not sure what vehicle you are coming from but they do vibrate more. The 3.5 is a little worse than the 3.7 at least from my experience.
At 95k miles you should def change spark plugs. Clean throttle body, clean the maf sensor, new air filter and check the coil packs. You can visually inspect the coil packs once you pull them for the plug change. Look for rotting rubber or signs of water getting down there, known to happen especially with the 06. A lot of dark fouling on the plug would indicate a cylinder might be misfiring. It wouldn't hurt to get new coil packs, from what it sounds like mom and son didn't take care of the vehicle. To add would be get some new oil in there ASAP.

 

[digglesworth]

Idle on mine is around 630 rpm
Also, when you do all this stuff, go ahead and unhook the battery to reset the PCM. Let it adjust everything to the new conditions...

 

[rsm688]

Thanks guys, Airborne I am pretty used to vibrating motors from old big vehicles to an inline 6 in my jeep to harleys. This seems like an issue above just not being a smooth running motor

It's weird I only notice the vibration at idle when it is sitting around 1100 rpm, twice when I cranked it it was more around 600 and was smooth the other two times it was around 1100 and vibrating til it warmed up some. Any idea what could cause the RPMs to vary that much at idle?

Thanks digglesworth, I'll make sure to get my PCM reset when I go and do all of it and let it relearn.


Thanks again for the help guys.

 

[USMC_TOP]

My 06 did the same thing. I put 93 octane in her and a bottle of Lucas fuel injector cleaner; haven't seen it again. Plus it gets 18 mpg on the highway opposed to 16 with 87 octane. Like others have already said try the cheep stuff first. Gas and fuel injector cleaner. You did say it sat for 8 months right? Bet it has water in the gas...........

 

[SuperBuickGuy]

a fault in a coil pack would set a code. How much have you driven it since it was sitting for 8 months, have you burned through the fuel that was in it? - some gas is super-crap, and it goes bad in 30 days. did you replace the fuel filter? have you run any kind of injector cleaner through the motor? if the problem is becoming more intermittent, it's likely it will go away.

 

[rsm688]

Thanks guys, yes it's been sitting for about 8 months just been cranked every couple of weeks but not driven any. That's a really good idea, sometimes I just overlook things. First thing I do with motorcycles is drain the gas tank and put in fresh fuel with SeaFoam, Ill put some fresh gas and injector cleaner in, as well as fresh plugs, oil, air filter, and fluids and see how she runs. The previous owner lived in a tiny town with two small junky gas stations so I'm sure the fuel is probably pretty poor, luckily the gas light is on so I shouldn't have to drain it just fill it with some fresh

 

[Woodtick]

X2 on the SeaFoam. I use it in everything.

 

[4speedfunk]

I use Lucas Deep Cleanse fuel injector cleaner....dump a bottle in the tank every now and then. It seems to take the shake out of the L5.

 

[Airborne]

Thanks guys, Airborne I am pretty used to vibrating motors from old big vehicles to an inline 6 in my jeep to harleys. This seems like an issue above just not being a smooth running motor

It's weird I only notice the vibration at idle when it is sitting around 1100 rpm, twice when I cranked it it was more around 600 and was smooth the other two times it was around 1100 and vibrating til it warmed up some. Any idea what could cause the RPMs to vary that much at idle?

Thanks digglesworth, I'll make sure to get my PCM reset when I go and do all of it and let it relearn.


Thanks again for the help guys.

Yes that is "somewhat" normal. The normal part is the idle is supposed to be higher until the ect gets up to normal operating temp. 1100 rpm is a little high for temps in the US right now. GM has played with the idle a little bit with our PCM though. The idle was a little too low for in gear setting they came out with an update for the PCM and up'd it a little I put mine a tiny higher than that at 850 rpm. In gear. In park I think it's around 800. I will check tomorrow to be sure. 600ish seems a little low.

Believe it or not idling is one of the more difficult things for an engine to do and by the idle alone many of the smaller issues going on with the motor will manifest themselves. Idling is a fine balance the engine is trying to maintain and when there is something wrong with anything in the engine system, usually the first place it's noticed is the idle. I would really change the oil to a good quality oil with a good filter of your choice. Really that would be the first thing I again suggest based on what you described above about previous owners.

 

[K0PIR]

You might want to take a look at it this too. http://youtu.be/yTqVblMzfw8